Spring3 配置拦截器，HandlerInterceptorAdapter-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_15951/article/details/82450998

本文介绍了如何在Spring MVC中自定义一个拦截器，用于校验用户登录状态，确保只有已登录用户才能访问特定资源。

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自己的拦截器需要继承org.springframework.web.servlet.handler.HandlerInterceptorAdapter，根据自己的业务需求复写其的几个方法

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

/**
 * 用户登录会话校验
 *
 */
public class LoginInterceptor extends HandlerInterceptorAdapter  {
    private String mappingURL;
    public void setMappingURL(String mappingURL) {
        this.mappingURL = mappingURL;
    }
    
    
    /**
     * 在DispatcherServlet完全处理完请求后被调用
     */
    @Override
    public void afterCompletion(HttpServletRequest arg0,
            HttpServletResponse arg1, Object arg2, Exception arg3)
            throws Exception {
       System.out.println("--afterCompletion");
        // TODO Auto-generated method stub
        
    }
    
    
    /**
     * 在业务处理器处理请求执行完成后,生成视图之前执行的动作
     */
    @Override
    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
            Object arg2, ModelAndView arg3) throws Exception {
        System.out.println("--postHandle");
        // TODO Auto-generated method stub
        
    }
    
    
    /**
     * 在业务处理之前调用
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object arg2) throws Exception {
        System.out.println("--preHandle");
        String url=request.getRequestURL().toString();   
        
        
//       // UserInfo userInfo = (UserInfo) request.getSession().getAttribute( "userInfo");
//        if (mappingURL == null || !url.matches(mappingURL)) {
//            response.sendRedirect("/login.htm");
//            return false;
//        }     
        return true; 
    }

}

applicationContext.xml内添加:

<!-- 拦截器 -->
    <mvc:interceptors>
		<mvc:interceptor>
			<mvc:mapping path="/student/*"/>
			<bean class="com.sunivo.framwork.demo.LoginInterceptor" />
		</mvc:interceptor>
	</mvc:interceptors>